Application of Dimensionally Stable Anode for Vanadium Redox Flow Battery

초록

All-vanadium redox flow battery (VRFB) is a type of redox flow battery which uses vanadium ions as active materials . 2.5mm thickness of graphite is generally used as bipolar plate inside the VRFB to prevent corrosion of current collector. In this research, thick graphite bipolar plate (BP) was substituted by 0.126mm thickness of dimensionally stable anode (DSA) coated with iridium oxide on a Ti substrate, which was anodized to TiO2 with nanotubular structure . It can provide volumetric advantage over the conventional graphite when the VRFB is used as multi-stack. Ir was coated by using spray coating method in order to improve electrochemical properties. In this study, various electrochemical characterization was carried out. Cyclic voltammetry data showed activation of Ir in the positive electrode of VRFB. Additionally, polarization measurements showed Ir-coated BP had low overpotential in the positive electrode of VRFB . In cell test results, VRFB, which used the Ir-coated BP, showed better efficiency than graphite-used VRFB in voltage and overall efficiency.